There seems to be an issue with sites getting sporadic intermittent 404s. The issues appears to be the exact same as seen here: Half of the requests for node js web app failing, render not able to serve all the requests - #4 by jeremy-render
Some sites hosted by my service are getting consistently a black/white web page error with the text “Not found” while some show up sporadically after multiple refreshes. It seems like a very random sporadic behavior.